US6656921B1 - Use of zinc hyaluronate against peptic ulcer - Google Patents
Use of zinc hyaluronate against peptic ulcer Download PDFInfo
- Publication number
- US6656921B1 US6656921B1 US09/403,714 US40371400A US6656921B1 US 6656921 B1 US6656921 B1 US 6656921B1 US 40371400 A US40371400 A US 40371400A US 6656921 B1 US6656921 B1 US 6656921B1
- Authority
- US
- United States
- Prior art keywords
- zinc
- hyaluronate
- zinc hyaluronate
- effect
- gastric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- VJVOFLWZDWLHNR-MRCUWXFGSA-N icosan-9-yl (z)-docos-13-enoate Chemical compound CCCCCCCCCCCC(CCCCCCCC)OC(=O)CCCCCCCCCCC\C=C/CCCCCCCC VJVOFLWZDWLHNR-MRCUWXFGSA-N 0.000 title claims abstract description 161
- 208000008469 Peptic Ulcer Diseases 0.000 title claims abstract description 29
- 208000011906 peptic ulcer disease Diseases 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 19
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/70—Carbohydrates; Sugars; Derivatives thereof
- A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/70—Carbohydrates; Sugars; Derivatives thereof
- A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
- A61K31/726—Glycosaminoglycans, i.e. mucopolysaccharides
- A61K31/728—Hyaluronic acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
- A61K47/61—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule the organic macromolecular compound being a polysaccharide or a derivative thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
Definitions
- the invention relates to pharmaceutical compositions with activity against peptic ulcer containing a zinc associate (complex) of hyaluronic acid as well as a process for the preparation thereof.
- the invention furthermore relates to the use of the zinc associate (complex) of hyaluronic acid, i.e. zinc hyaluronate for the preparation of pharmaceutical compositions of activity against peptic ulcer and a method for the treatment and prevention of peptic ulcer.
- the invention also relates to the use of zinc hyaluronate for the prevention of reinfection after the healing of peptic ulcer.
- Hyaluronic acid The macromolecule known as hyaluronic acid usually occurring in the form of its sodium salt, is a compound known for more than 50 years. It had first been described by Meyer et al [J. Biol. Chem. 107, 629 (1934)].
- Hyaluronic acid is a highly viscous native glucosaminoglycan containing alternating ⁇ 1-3 glucuronic acid and ⁇ 1-4 glucosamine moieties, its molecular weight is between 50000 and several millions.
- Hyaluronic acid is found in the connective tissues of all mammals; it occurs in higher levels in the skin, vitreous body of the eye, synovial fluid, umbilical cord as well as cartilaginous tissue.
- hyaluronic acid has been employed as the sodium salt in therapy—mainly in ophthalmology, dermatology, surgery, articular therapy—and cosmetics.
- the salts of hyaluronic acid formed with alkali, alkaline earth, magnesium, aluminum, ammonium and substituted ammonium ions may serve as carriers for promoting the absorption of drugs (see the Belgian patent specification No. 904,547).
- Heavy metal salts of hyaluronic acid, among these the silver salt are employed as fungicides; whereas the gold salt is useful for the treatment of rheumatoid arthritis (see the patent specification No. WO 87/05517).
- severe adverse effects of silver and gold compounds are known, i.e.
- the zinc associate (complex) of hyaluronic acid i.e. zinc hyaluronate possesses significant gastroprotective activity so it can be used in the prophylaxis and treatment of peptic ulcers including Helicobacter pylori-induced ulcers.
- Peptic ulcer disease is a complex and multifactorial disease which concerns a great part of civilized population. Many questions still remain in relation to the exact pathogenesis of this disease. In the last five years a new approach has emerged due to the “re-discovery” of Helicobacter pylori. It is generally accepted that the development of peptic ulcer disease in humans is associated with the infection of Helicobacter pylori, but on the other hand H. pylori can not be held responsible for all causes of peptic ulcer. Up to now the peptic ulcer therapy has not changed essentially: still H 2 blockers and proton pump inhibitors are the most important requisites of the therapeutic arsenal, whilst the possible therapeutical methods for killing the H. Pylori bacteria are now disclosed in the literature. In addition, the treatment of gastro-duodenal damage caused by nonsteroidal anti-inflammatory drugs has become the center of interest.
- a peptic ulcer developed by any mechanism, may be characterized by an upset of that balance, which exists under healthy conditions between aggressive factors—which induce development of ulcers—and defensive factors—which protect the stomach against induction of ulcers.
- aggressive factors include the resistance of gastric mucosa, sufficient blood supply of gastric mucosa, and mucus formation [H. Shay: Etiology of peptic ulcer, Am. J. Dig. Dis. 6, 29-49 (1961)].
- the leading ones are the secretion of hydrochloric acid and pepsin as well as all factors stimulating the secretion of any of both substances.
- the secretion of acid may be enhanced also by a pathological vagal stimulus or increased gastrin formation, by an autoimmune mechanism and in some cases by hormonal effect.
- the balance between aggressive and defensive factors may be disturbed also by injuries affecting the whole body.
- peptic ulcer is a multifactorial disease.
- Agents used in ulcer therapy are intended to reduce the role of aggressive factors and/or to enhance the role of defensive factors.
- the pharmacological investigations have sought ways to weaken the effects of aggressive factors so the primary target was to moderate the acid-pepsin activity.
- Drugs used in the treatment of ulcer were targeted first to neutralize the acid (antacids such as sodium hydrogen carbonate, or aluminum hydroxide) or to inhibit its secretion (H 2 blockers, e.g.
- cimetidine famotidine
- proton pump inhibitors e.g. omeprazole
- compositions strengthening the defensive factors are available only in a limited number and they show some side effects.
- Such compositions are colloidal bismuth subcitrate (CBS, DeNol), sucralfate and misoprostol.
- CBS contains bismuth, which is responsible for toxicological problems.
- Sucralfate a basic aluminum salt of sulphated sucrose possesses some adverse effects, e.g. nausea, vomiting, aluminum intoxication, etc., and the misoprostol, a synthetic prostaglandin analogue, induces an enhanced intestinal activity or nausea.
- the reinforcement of protective mechanism can be important for ulcers caused by Helicobacter pylori infection, too, since the bacteria produce a number of toxins and enzymes (urease, protease, catalase, lipase) damaging the gastric mucosa and giving a free way for the acid and pepsin towards gastric epithelium.
- toxins and enzymes urease, protease, catalase, lipase
- An object of the invention is to provide pharmaceutical compositions with anti-peptic ulcer effect, containing zinc associate (complex) of hyaluronic acid i.e. zinc hyaluronate as active ingredient; as well as to a process for the production thereof by mixing the zinc hyaluronate active ingredient (prepared in a known manner) with therapeutically useful carriers and/or additives and converting the mixture to a pharmaceutical composition.
- zinc associate complex of hyaluronic acid i.e. zinc hyaluronate
- Another object of the invention is the use of the zinc associate (complex) of hyaluronic acid for the preparation of pharmaceutical compositions with activity against peptic ulcer and a method for the treatment and prevention of peptic ulcer.
- molecular weight is meant a mean value of molecular weights shown by a mixture of molecules with various degrees of polymerization measured by a given method of molecular weight determination.
- the zinc hyaluronate associates of various molecular weights were dissolved in an aqueous solution of 1.0% for the pharmacological experiments.
- the following example described the preparation's procedure of 1.0% solution of zinc hyaluronate. If not noted otherwise, the percentages mean weight/volume% values.
- Sodium hyaluronate (1.0 g) is swollen in 30 ml of water while constant stirring then after adding 18.75 ml of 0.1 molar zinc chloride solution it is filled to 100 ml with distilled water.
- the employed doses of solutions containing zinc hyaluronate with various molecular weights and degrees of purity, as well as of sodium hyaluronate and zinc chloride solutions were diluted with distilled water and administered in a volume of 10 ml/kg of body weight.
- the doses of sucralfate used as reference substance as well as indomethacin and powdered charcoal were suspended in 1-2 drops of Tween 80 and diluted to 5 ml/kg of body weight with physiological saline (0.9% by weight/volume of sodium chloride).
- N-ethylmaleimide and N G -nitro-L-arginine methyl ester were diluted to a volume of 5 ml/kg of body weight.
- the platelet activating factor (PAF) was dissolved in 0.25% by weight/volume bovine serum albumin prepared with 0.9% by weight/volume sodium chloride solution.
- the sources of substances employed were as follows.
- the pharmacological activity of the zinc hyaluronate associate was studied by using the following methods.
- mice Female RG-Wistar rats weighing between 120-150 g were used. Before experiments animals were fasted for 24 hours but received water ad libitum.
- Acidified ethanol (mixture of 50 ml of abs. ethanol and 1 ml of concentrated HCI) was used as strong irritants. Dose of acidified ethanol was 0.5 ml/100 g body weight with intragastric administration. Test compounds were given orally 30 minutes before the acidified ethanol challenge. When the duration of action of test compound was studied test material was administered 60 or 120 minutes earlier to the irritating effect induced by acidified-ethanol effect. One hour after the acidified ethanol treatment rats were sacrificed by cervical dislocation. Stomachs were removed and opened along the greater curvature and mildly washed down. The longitudinal hemorrhagic lesions were assayed by length.
- ED 50 value was defined as the dose that gave a 50% decrease in ulcer index.
- L-N G -nitroarginine methyl ester L-NAME
- L-NAME L-N G -nitroarginine methyl ester
- ED 50 value represents the dose which protects the stomach by 50 % from the damaging effect of indomethacin.
- Test compounds were given orally. 30 minutes later the animals were immobilized in plastic restraint boxes then placed into a refrigerator at 4° C.-8° C. temperature. Four hours later the animals were removed from both the refrigerator and the restraint boxes and one hour later they were sacrificed by cervical dislocation.
- the stomachs were removed, opened along the greater curvature and hemorrhagic lesions were scored by a zero to 3 scale: stomachs free from any damage were given a score of 0, stomachs with only a few hemorrhagic lesion were given a score of 1, stomachs with more lesion numbers than 10 were given a score of 2, and stomachs with a lot of lesions were characterized with a score of 3.
- the ED 50 were defined as the dose needed to decrease the score of gastric lesions by 50%. The results can be observed in the following Tables.
- mice Male, RG-Wistar rats weighing between 200-250 g were used. Before the experiments animals were fasted for 24 hours but received water ad libitum. Experiments were carried out according to the technique similar to that described by Wallace and Whittle (1986). [Br.J.Pharmac., 89,415, (1986)]. Animals were anaesthetized by intraperitoneal administration of urethane at a dose of 1 g/kg in a volume of 10 ml/kg. Femoral vein was then prepared and cannulated for administration of ulcerogenic PAF. After the surgery PAF was infused intravenously at a rate of 0.1 ml/min for ten minutes at a dose of 200 ng/kg/min.
- Test compounds were given 30 minutes before the PAF challenge. One hour after the infusion of PAF animals were sacrificed by cervical dislocation; their stomachs were removed and opened along the greater curvature. The hemorrhagic erosions were evaluated by a zero to three scoring system. Stomachs free from any damage were characterized by a score of zero, stomachs with only a few, little change from normal were given a score of 1, stomachs with a moderate damage were characterized by a score of 2, and stomachs with severe, diffuse hyperaemia and/or haemorrhagia were given a score of 3.
- PAF platelet activating factor
- the chronic gastric ulcer was induced by the injection of 25 ⁇ l/animal of 20% (v/v) acetic acid into the gastric wall under light ether anaesthesia according to the method similar to that described by Takagi et al. (1969).
- the oral treatment with the test compounds was started five days after the surgery and continued in a once-a-day regimen up to the 14th day.
- the animals were killed on the 15th day and their stomachs were dissected.
- the severity of ulceration was evaluated by the measurement of the diameter of the ulcers and the area affected was calculated.
- the healing effect was expressed as differences in percentage between the control and test group values.
- Acetic acid irritates the stomach wall and causes a well defined ulcer, which is very similar to the human ulcer both in its form as well as in its microscopical picture.
- the results are illustrated in the following Tables.
- FIG. 1 is a series of bar graphs comparing at specified dosages the healing effect of Zn hyaluronate (E), zinc hyaluronate (M) and sucralfate on acetic acid-induced chronic gastric ulcer.
- Zinc hyaluronate(II) accelerated the healing of chronic gastric ulcer induced by acetic acid (Table 21). A significant (p ⁇ 0.005) change was observed at a dose of 1 mg/kg; however, not a negligible curative effect was measured even with a dose 0.01 mg/kg. Neither zinc hyaluronate(I), nor zinc hyaluronate(III) had any effect on chronic ulcer healing at a dose of 1.0 mg/kg (Table 22)
- the reference sucralfate was also less effective in accelerating the gastric ulcer healing than the zinc hyaluronate(II) as it is shown in Table 23.
- the dose of sucralfate had to be increased to 500 mg/kg to achieve an enhancement of 53% in the curative effect.
- Zinc hyaluronate (M) also accelerated the healing of acetic acid induced ulcer, however, the accelerating effect was less pronounced than that of zinc hyaluronate(Il). Zinc hyaluronate (M) also exerts its maximum activity at a dose of 1 mg/kg, a result confirming our observation discussed above i.e. that the effects of zinc hyaluronates of various origin are not significantly different from each other (Table 24 and FIG. 1 ).
- test compound was given to animals orally 3 times over 48 hours in 24 hour equal intervals. The first introduction of test compound preceded the single indomethacin treatment by 60 minutes. Animals were killed 72 hours after the first administration of the test compound. Control animals received vehicle instead of test compound and normal rats mean non-fasted, non-treated rats.
- the small intestine segment from pylorus to cecum was removed, placed into 0.9% (w/v) sodium chloride solution at 37° C. and it was connected with a BP recorder through one of its ends via a polyethylene cannula. After ligating both ends of the prepartum the pressure was increased inside the intestine until air bubbles appeared at the weakened site of the intestinal wall. This pressure is expressed in Hgmm and is denoted tensile strength (TS). The results are shown in the following Table 25.
- Test compounds were given orally at a dose of 100 mg/kg. Control animals received physiological saline solution instead of test compounds. 30 minutes later, the 5% (w/v) charcoal suspension was administered orally at a volume of 0.5 ml/animal. 60 minutes after the charcoal treatment the animals were sacrificed by cervical dislocation. The intestine from pylorus to cecum was removed, its lengths measured along with the distance traversed by the charcoal meal.
- Motility was expressed as the ratio of length of charcoal suspension to the length of the whole intestine. The results are shown in the following Tables.
- MIC Minimum inhibitory concentration
- NO which is biosynthetized from L-arginine (Moncada et al., 1991) has been implicated in the gastric protective effects of different antiulcer drugs e.g. aluminum-containing antacids.
- endogenous NO has shown to have a regulatory role in gastric mucosal blood flow (Lippe et al., 1992) and in mast cell reactivity (Salvemini et al. 1994), as well.
- Non-steroidal anti-inflammatory drugs cause gastric lesions or in more severe cases gastric ulcers which is due to their direct damage to the gastric mucosa, topical irritation and to their indirect effect arising from the systemic inhibition of prostaglandin synthesis.
- Zinc hyaluronate (I), (II), (III) and (M) proved to be effective against indomethacin induced gastric damage, too.
- indomethacin tests also support the view that zinc hyaluronate is more than just a simple physicochemical barrier between the gastric lumen and gastric mucosa, since its action appears not only after oral (see: acidic alcohol test) but after subcutaneous administration, too.
- zinc hyaluronates protect the gastric mucosa against the damaging effect of indomethacin.
- the protective action of zinc hyaluronates moreover exceed the effect of sucralfete as well.
- Zinc hyaluronate with a molecular weight of 900.000 dalton proved to be more effective than zinc hyaluronate of higher or lower molecular weights, a fact demonstrating a relation between molecular weight and activity.
- zinc hyaluronate can be useful as supplementary therapy in the cure of Helicobacter pylori-induced ulcers or in a prophylactic treatment against re-infection.
- the amounts of antibiotics used in the therapy of Helicobacter pylori may possibly be reduced; as well as the anti-Helicobacter pylori agents used at present, which induce several side effects, may possibly be substituted.
- Zinc hyaluronate can be converted to pharmaceutical compositions by mixing it with non-toxic, inert solid or liquid carriers and/or other auxiliaries which are commonly used in the therapy for enteral administration.
- Useful carriers are e.g.: water, gelatin, lactose, starch, pectin, magnesium-stearate, stearic acid, talc, vegetable oils such as peanut oil, olive oil and the like.
- the active ingredient may be formulated in any usual oral pharmaceutical composition, produced from a powder prepared in a known way, such as tablet, pellet, capsule, solution and the like.
- the active compound can preferably be administered in a form of concentrated aqueous solution, which may be prepared as described in Examples 1. and 4.
- the advantage of formulation as an aqueous solution is that no time is required for the active substance to dissolve in the gastric juice, the composition can be prepared without additives; and the daily dose can optionally and exactly be chosen.
- compositions can be prepared in a known manner by usual pharmaceutical technology and, if desired they may be subjected to other usual operations, e.g. sterilization.
- the mixture is compressed to tablets of 200 mg weight.
- a pellet is prepared in a known manner, e.g. in a vortex granulating equipment.
- the pellet is formulated in sachets, vials or capsules.
- Zinc hyaluronate 1.0 g Distilled water q.s. 100 ml
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HU9700826A HU225991B1 (en) | 1997-04-29 | 1997-04-29 | Use of the zinc hyaluronate associate (complex) for the preparation of pharmaceutical compositions for oral use against peptic ulcer |
HU9700826 | 1997-04-29 | ||
PCT/HU1998/000044 WO1998048815A1 (en) | 1997-04-29 | 1998-04-28 | Use of zinc hyaluronate against peptic ulcer |
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JP (1) | JP2001522361A (pt) |
KR (1) | KR100572190B1 (pt) |
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EE (1) | EE04953B1 (pt) |
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HK (1) | HK1025250A1 (pt) |
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NO (1) | NO328313B1 (pt) |
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US20080312429A1 (en) * | 2005-12-02 | 2008-12-18 | Peixue Ling | Bismuth Hyaluronate, the Preparation Method and the Use Thereof |
US20090253483A1 (en) * | 2005-09-09 | 2009-10-08 | Pacey Larry J | Wagering Game System with Community Gaming System |
EP2289522A1 (en) | 2009-08-14 | 2011-03-02 | Holy Stone Healthcare Co.,Ltd. | Mixture of hyaluronic acid for treating and preventing peptic ulcer and duodenal ulcer |
US20110166099A1 (en) * | 2010-01-04 | 2011-07-07 | Wu Tsung-Chung | Mixture of hyaluronic acid for treating and preventing peptic ulcer and duodenal ulcer |
US8722644B2 (en) | 2010-01-04 | 2014-05-13 | Holy Stone Healthcare Co., Ltd. | Mixture of hyaluronic acid for treating and preventing peptic ulcer and duodenal ulcer |
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HU225991B1 (en) | 1997-04-29 | 2008-02-28 | Richter Gedeon Nyrt | Use of the zinc hyaluronate associate (complex) for the preparation of pharmaceutical compositions for oral use against peptic ulcer |
ITPD980168A1 (it) * | 1998-07-06 | 2000-01-06 | Fidia Advanced Biopolymers Srl | Composizioni biocompatibili e biodegradabili comprendenti acido ialuronico e suoi derivati per il trattamento delle ulcere dell'appara |
HUP0303779A2 (en) * | 2003-11-20 | 2006-02-28 | Richter Gedeon Vegyeszet | Pharmaceutical compositions containing hyaluronan complex for the treatment of sclerosis multiplex |
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ITMI20061132A1 (it) * | 2006-06-13 | 2007-12-14 | Sinclair Pharmaceuticals Ltd | Composizioni topiche antimicrobiche comprendenti lattoferrina, acido ialuronico o suoi sali ed estratti vegetali |
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HUP0900717A3 (en) | 2009-11-18 | 2012-02-28 | Richter Gedeon Nyrt | Pharmaceutical composition for urological use containing zinc hyaluronate |
ES2388281B1 (es) * | 2010-12-27 | 2013-10-01 | Laboratorios Viñas S.A. | Composición farmacéutica que comprende ácido hialurónico y un compuesto de zinc y pastilla con palito y procedimiento para preparación correspondientes |
WO2013129577A1 (ja) * | 2012-03-01 | 2013-09-06 | キユーピー株式会社 | TGF-β発現促進経口剤、痛み物質産生抑制経口剤及び浮腫抑制経口剤 |
US20160287627A1 (en) * | 2013-11-22 | 2016-10-06 | Kewpie Corporation | Method for suppressing onset of gastric ulcer as adverse effect of drug, oral pharmaceutical composition for suppressing onset of gastric ulcer and method for producing the same |
CN104262499A (zh) * | 2014-09-03 | 2015-01-07 | 佐源集团有限公司 | 一种低聚果糖锌及含有低聚果糖锌的口服液 |
CN108051553A (zh) * | 2017-12-29 | 2018-05-18 | 武汉轻工大学 | 一种仔猪肠道功能保护剂的筛选方法 |
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US5554598A (en) | 1989-02-24 | 1996-09-10 | Chemical Works Of Richter Gedeon Ltd. | Method of treating crural or decubitus ulcer with zinc hyaluroric acid complex |
US6458774B1 (en) * | 1989-02-24 | 2002-10-01 | Richter Gedeon Vegyeszeti Gyar Rt. | Compositions containing hyaluronic acid associates and a process for preparing same |
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US20090253483A1 (en) * | 2005-09-09 | 2009-10-08 | Pacey Larry J | Wagering Game System with Community Gaming System |
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US8722644B2 (en) | 2010-01-04 | 2014-05-13 | Holy Stone Healthcare Co., Ltd. | Mixture of hyaluronic acid for treating and preventing peptic ulcer and duodenal ulcer |
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